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Finding the Fourth Proportional to 690.61, 1,033.52 and 661.91

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Solution

The fourth proportional to 690.61, 1,033.52 and 661.91 is: 990.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.61 : 1,033.52 = 661.91 : x
  2. Step 2: Convert to fraction form
    690.61/1,033.52 = 661.91/x
  3. Step 3: Cross multiply
    690.61x = 1,033.52 × 661.91
  4. Step 4: Simplify right side
    690.61x = 684,088.75
  5. Step 5: Solve for x
    x = 684,088.75/690.61
  6. Step 6: Final answer
    x = 990.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.